The pill and being secretive

I'm 18 and have been sexually active for 4 months. I've had a pregnancy scare and I didn't like it at all. My boyfriend and I are very diligent about using condoms every time we have sex, but sometimes things happen. I want to be responsible and safe and get on the pill but my parents don't know that I'm sexually active and would not approve if I told them I was. If I go to a planned parenthood clinic do I have to see an obgyn to get the pill or can they just give me a prescription for it? Also, can I buy it out of pocket because if I use my insurance it will show up and my parents will see it? HELP!